From: Jan Kara <jack@suse.cz>
To: Dave Jiang <dave.jiang@intel.com>
Cc: akpm@linux-foundation.org, dave.hansen@linux.intel.com,
mawilcox@microsoft.com, linux-nvdimm@lists.01.org,
linux-mm@kvack.org, vbabka@suse.cz, jack@suse.com,
dan.j.williams@intel.com, ross.zwisler@linux.intel.com,
kirill.shutemov@linux.intel.com
Subject: Re: [PATCH 0/3] 1G transparent hugepage support for device dax
Date: Tue, 24 Jan 2017 12:12:48 +0100 [thread overview]
Message-ID: <20170124111248.GC20153@quack2.suse.cz> (raw)
In-Reply-To: <148521477073.31533.17781371321988910714.stgit@djiang5-desk3.ch.intel.com>
On Mon 23-01-17 16:47:18, Dave Jiang wrote:
> The following series implements support for 1G trasparent hugepage on
> x86 for device dax. The bulk of the code was written by Mathew Wilcox
> a while back supporting transparent 1G hugepage for fs DAX. I have
> forward ported the relevant bits to 4.10-rc. The current submission has
> only the necessary code to support device DAX.
Well, you should really explain why do we want this functionality... Is
anybody going to use it? Why would he want to and what will he gain by
doing so? Because so far I haven't heard of a convincing usecase.
Honza
>
> ---
>
> Dave Jiang (1):
> dax: Support for transparent PUD pages for device DAX
>
> Matthew Wilcox (2):
> mm,fs,dax: Change ->pmd_fault to ->huge_fault
> mm,x86: Add support for PUD-sized transparent hugepages
>
>
> arch/Kconfig | 3
> arch/x86/Kconfig | 1
> arch/x86/include/asm/paravirt.h | 11 +
> arch/x86/include/asm/paravirt_types.h | 2
> arch/x86/include/asm/pgtable-2level.h | 17 ++
> arch/x86/include/asm/pgtable-3level.h | 24 +++
> arch/x86/include/asm/pgtable.h | 145 +++++++++++++++++++
> arch/x86/include/asm/pgtable_64.h | 15 ++
> arch/x86/kernel/paravirt.c | 1
> arch/x86/mm/pgtable.c | 31 ++++
> drivers/dax/dax.c | 82 ++++++++---
> fs/dax.c | 43 ++++--
> fs/ext2/file.c | 2
> fs/ext4/file.c | 6 -
> fs/xfs/xfs_file.c | 10 +
> fs/xfs/xfs_trace.h | 2
> include/asm-generic/pgtable.h | 75 +++++++++-
> include/asm-generic/tlb.h | 14 ++
> include/linux/dax.h | 6 -
> include/linux/huge_mm.h | 83 ++++++++++-
> include/linux/mm.h | 40 +++++
> include/linux/mmu_notifier.h | 14 ++
> include/linux/pfn_t.h | 8 +
> mm/gup.c | 7 +
> mm/huge_memory.c | 249 +++++++++++++++++++++++++++++++++
> mm/memory.c | 102 ++++++++++++--
> mm/pagewalk.c | 20 +++
> mm/pgtable-generic.c | 14 ++
> 28 files changed, 952 insertions(+), 75 deletions(-)
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
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next prev parent reply other threads:[~2017-01-24 11:12 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-23 23:47 [PATCH 0/3] 1G transparent hugepage support for device dax Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-23 23:47 ` [PATCH 1/3] mm,fs,dax: Change ->pmd_fault to ->huge_fault Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-23 23:47 ` [PATCH 2/3] mm, x86: Add support for PUD-sized transparent hugepages Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-23 23:47 ` [PATCH 3/3] dax: Support for transparent PUD pages for device DAX Dave Jiang
2017-01-23 23:47 ` Dave Jiang
2017-01-24 11:12 ` Jan Kara [this message]
2017-01-24 18:26 ` [PATCH 0/3] 1G transparent hugepage support for device dax Dan Williams
2017-01-24 18:26 ` Dan Williams
2017-01-24 21:24 ` Konrad Rzeszutek Wilk
2017-01-24 21:35 ` Nilesh Choudhury
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